移动端初始化常用JavaScript代码

<script type="text/javascript">
        (function (doc, win) {
    var docEl = doc.documentElement,
        resizeEvt = ‘orientationchange‘ in window ? ‘orientationchange‘ : ‘resize‘,
        recalc = function () {
            var clientWidth = docEl.clientWidth;
            if (clientWidth > 640){ 
                clientWidth = 640;
            }
            docEl.style.fontSize = (clientWidth / 10) + ‘px‘;
        };

    if (!doc.addEventListener) return;
    win.addEventListener(resizeEvt, recalc, false);
    doc.addEventListener(‘DOMContentLoaded‘, recalc, false);
})(document, window);
</script>

//判断手机横竖屏状态：
window.addEventListener("onorientationchange" in window ? "orientationchange" : "resize", function() {
        if (window.orientation === 180 || window.orientation === 0) { 
            alert(‘竖屏状态！‘);
        } 
        if (window.orientation === 90 || window.orientation === -90 ){ 
            alert(‘横屏状态！‘);
        }  
    }, false); 
//移动端的浏览器一般都支持window.orientation这个参数，通过这个参数可以判断出手机是处在横屏还是竖屏状态。